Threading die



Nov. 24, 1931. TULL 1,833,661

THREADING DIE Filed Jan. 5. 1929 30 ljz FATE Patented Nov. 24, 1931 NT OFFICE" JOHN s maysw es onrcaeainnmois, ASSIGNOR To WESTERN ELECTRIC ooM- 241w, mooru i i m'rzn, orv NEW YORK, N. Y., A CORPORATION or NEW YORK i mnnsniive' DIE fifla iieafio and 1 m 5,1929. seriarno. 330,587.

-This invention=relates' 'to dies, and more 1 particularly to vadj'ustable threading dies. 1

'j In threading metal parts it is desirable to use a die havingsections which are easily and readily replaceable, It is also desirable that such sections be "adj ustedl with a minimamf effort and that they' be efli'ciejnt in operation;

v It is an object of the present invention to provide a 1 simple and eifi'cient die;-'whe'rei-n the parts may be produc'ed economi'cally and readily assembledand disassembled. 1 f f "In order't'o accomplish this and other object s, there is provided in 'a'ccordancewith T the general features of the invention in 'one embodiment thereof an adjustable'threading diehaving a die-head member with a conical endiprovided with three radial slots'for receiving'f "rectan ular Chasers for threading members, the threaded portions of which are fparallel'with the aids of the head and the opposite ends of which 'abut a flared adjust} f a ing ring threaded upon the head and receiving an inwardly threaded; cap securing the "25 chasers 'inposition in the slots. Resilient projecti'ons of a' tubular spring member abut against the threaded ends of the 'chasers and hold them, in position against the flared aajusting ring'while the threadedcap is being tightened} r j;

I v A clear understanding of the invention will bel'had; from the following description of one specific embodimentzthereofwhen taken connection with theaccompanying drawings, wherein the adjustable-dim v v o J Fig.-2-is-an endview of the die;

Fig. 3 is an enlarged vertical, sectional view .Eigflllisa longitudinal, sectional iew of Hg. 4 is anenlarged-perspective view of a horseshoe-shaped locking} member for the adjusting ringof'Fig. 3, and I r Fig. 5 islan enlarged perspective view ofa I ventional structure'shown in dotted outline and designated generally by the numeral 11. The die structure consists of a tubular die retaining'head 13 having a conical face 14 which is provided with three corresponding- 1y sloped slots 15 for receiving chasers. "The die retaining head 13-has a central cylindrical aperture 16 extending lengthwise of the tool and connecting with a transverse aperture 17 1) for providing an outlet for the chips falling from the chasers',' and in the cylindrical aperture 16 there is frictionally positioned a tubular spring member 18 (Fig; i

which has forwardly projecting resilient portions 19 that extend slightly into the spacesadjoining the slots 15 for receiving the chasers."

Chasers or threading members 20 ea ch pro 5 vided with a shoulder portion 22 (Fig. 1) and a rectangular shank portion 23 are slidably positioned within the slots15 with the shoulder portions 22 engaging the ends of theresilient portions 19 of the tubular spring member 18'so as to resiliently prevent the chasers from moving towards the center of the tool. An adjusting ring 24: (Fig. 3) having inner threads 25 cooperating with outer threads 26 on the tubular die retaining head 13 has a flared inner surface 27 which abuts against the ends of the shanks 23 of the chasers 20 and is adapted to force the chasers 2O inwardly against the resisting force of the resilient projections 19 upon the actuation of the flared adjusting ring 24 toward the left (Fig. 1) over the die retaining head 13.

An annular cap member 30 provided with inner threads 31 for cooperating with outer threads 32 on the adjusting ring 24 has a dially movable in the slots, a ring member threaded on said head and having a flared inner surface engaging the outer portions of the chasers and having a, flexible portion also threaded on the die head, means for I flexing the flexible portion to lock the ring member in fixed position relative to the die head, and releasable means cooperating with the ring member to secure the chaser-s in fixed positions relative to the die head.

In Witness whereof, I hereunto subscribe my name this 24th day of December, A. D. 1928. A

JOHN STANLEY STULL. 

